Rotary pump or compressor



e. H. STALLMAN.

ROTARY PUMP 0R COMPRESSOR.

APPLICATION FILED DEC. 17, 1920- 1,418,741 tented June 6, 1922.

GRANVILLE H. STALLMAN, OF CHICAGO, ILLINOIS.

ROTARY PUMP OR COMPRESSOR.

Specification of Letters Patent. Patented June 6, 1922,

Application filed December 17, 1920. Serial No. 431,339.

To a w]: om it may concern:

Be it known that I, GRANVILLE H. STALL- MAN, a citizen of the UnitedStates, residing at Chicago,- in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in RotaryPumps or Compressors, of which the following is a specification.

This invention relates to improvements in a rotary pump or compressor,particularly adapted though not necessarily limited in its use formoving or handling fluids or plastic materials, and one of the objectsof the invention is to provide an improved apparatus of this characterwhich will be simple in construction, effective and eflicient inoperation. and economical in power.

A further object is to provide an improved apparatus of this characterembodying two co-operating and inter-meshing rotary elements so shapedas to alternately form closed pockets in the elementsand in whichpockets portions of the material are first trapped, then subjected to agradually increasing pressure while in the pocket and finally ejectedfrom the respective pockets as the pockets assume predeterminedpositions with relation to a discharge outlet passage.

To the attainment of these ends and the accomplishment of other new anduseful objects as will appear, the invention consists in the features ofnovelty in substantially the con truction, combination and arrangementof the several parts hereinafter more fully described and claimed andshown in the accompanying drawing illustrating this invention, and inwhich Figure 1 is a vertical sectional view as taken on line 1- Figure2, of a machine adapted to pump compressible materials.

Figure 2 is a horizontal view as taken on line 22, Figure 1.

Figure 3 is a view of the machine for handling incompressible materials.

In the specification and claims the invention will be described inconnection with the moving or compressing of a fluid, but it is to beunderstood that this invention and the same principle thereof is welladapted for use in moving or handling plastic materials, as for instancethe apparatus may be effectively employed as a stufiing machine, and itis therefore to be understood that the term fluid as used throughout thespecification and claims, for the sake of uniformity, is not to beconstrued to be a term of limitaing 12.

hlS casing 10, may be of any desired size and configuration.

Rotatably mounted within the casing are elements l3-14, and theseelements are respectively provided with a series of circumferentiallyspaced teeth or projections 15-46, and the elements are so arranged thatthese teeth or projections will mesh. The teeth or projections areformed preferably with substantially circular shaped extremi ties 17,the throats 18, of the teeth being reduced so as to form pockets orchambers 19, intermediate adjacent teeth or projections and at the basethereof. The ends 17 of the teeth or projections 16, are of a size andconfiguration so as to conform to the contour of the pockets 19, so thatwhen they enter the respective pockets they will fill the pockets for apurpose to be hereinafter set forth. Y

The elements are respectively mounted for rotation upon hollow shafts20-21, which project through one end 22, of the casing 10, suitablepacking 23, being provided to prevent the escape of fluid. These hollowshafts 20-21 are preferably connected at their free extremities by meansof a manifold 24, having a common discharge outlet 25, suitablecouplings 26, being employed in connecting the manifold with the shafts.These shafts 2021 project into the respective elements 1314 for anydesired distancebut preferably terminate short of one end of therespective elements so that a portion of the elements will form closures2728 for the ends of the shafts, and the shafts are respectivelyprovided with openings 2930 extending radially therethrough and indirections lengthwise of the shaft The elements 1314 may be of anydesired length and are arranged within a chamber 29 formed within thecasing 10, by means of a wall- 31, which co-operates with the end 22, ofthe casing. The outer wall of the casing is projected beyond the wall31, and is closed by another wall 32, to form a chamber 33. The elements13-14 are respectively provided with trunnions' 34 -35, which passthrough the wall 31 and are journaled in suitable bearings 36-37arranged within the chamber 33, and connected with these trunions 3435,are intermeshing gears 38-39, which are given rotation through themedium of a shaft 40, from any suitable source of power. The pinionswhen thus rotated will impart a rotary movement to the elements 13-14. Asuitable packing 41, may be provided for the shaft 40.

Each of the pockets 19, is provided with a discharge opening 42, leadingtherefrom and as the elements 13-14 are rotated the discharge openings42, from the pockets will be successivel brought into and out ofengagement with the respective openings 29- 30, in the shafts 20, 21 toestablish communication between the pocket and the discharge outlet 25.

In use the fluid is supplied to the casing 10, through the inlet opening12, and as the elements 13-14 are rotated the teeth or projections 15-16on the respective elements 13-14, will be successively pro ected intothe pockets 19, of the other element w1th the result that theseprojections or teeth 15-16, will first close the pockets to trapportions of the fluid in the pockets and a continued rotation of theelements will cause a gradually increasing pressure to be exerted uponthe trapped fluid in the pocket while the projection on one element isentering the pocket in the other element. This gradually increasingpressure which has thus been exerted u on the trapped fluid willcontinue until t e respective elements 13-14 are moved to a positlonthat the discharge outlet 42, thereof is brought into register or incommunication with the discharge outlet 25, through the medium of therespective openings 29-30, in the shafts 20-21, at which time the toothor projection will continue to enter the pocket and fill the pocketwhile at the same time the trapped fluid in the pocket will be ejectedthrough the discharge outlet 42.

It will thus be seen that as the elements 13-14 are rotated theoperation above described will continue and the fluid will be compressedand ejected alternately from the pockets in the two elements.

Obviously the various ports of this apparatus will be correspondinglyarranged according to the material which isbeing handled thereby, so asto compensate the different natures of the material.

In Figure 3, the ports 29 and 30' in the respective pipes 20 and 21 areenlarged so as to avoid compression in the pockets 19 before thematerial is dischar ed therefrom.

While the preferred form 0 the invention has been herein shown anddescribed it is to be understood that various changes may be made in thedetails of construction and in the combination and arrangement of theseveral parts, within the scope of the claims, without departing fromthe spirit of this invention.

What is claimed as new is:

.1. An apparatus of the character described embodying a fluid receivingcasing having an inlet and a discharge outlet, a rotary element in thecasing provided with recesses formin chambers, said chambers each havinga dlscharge outlet movable into ,and out of communication with the firstsaid discharge outlet, and means co-operating with the said chambers forclosing them, the said means operating to compress the fluid within thechambers when the discharge outlet thereof is out of communication withthe first said outlet, and also operating to force the fluid from thechamber when the said outlets are brought into communication.

2. An apparatus of the character described embodying a casing, having aninlet and a discharge outlet for the fluid to be operated upon, a rotaryelement in the casing provided with independent chambers or spaces forreceiving the fluid, said chambers each having a discharge outlet, thelast recited outlets being movable into and out of communication withthe first recited outlet as the element is rotated, and means operatingto first successively close the chambers to trap the fluid therein andthen compress the fluid within the chamber when the outlet therefrom isclosed, the said means moving with the chamber to eject the fluidtherefrom when the outlet of the chamber moves into communication withthe first recited outlet.

3. An apparatus of the character described embodying a casing, having aninlet and a discharge outlet for the fluid to be operated upon, a rotaryelement in the casing provided with independent chambers or spaces forreceiving the fluid, said chambers each having a discharge outlet, thelast recited outlets being movable into and out of communication withthe first recited outlet as the element is rotated, and means operatingto first successively close the chambers to trap the fluid therein andthen compress the fluid within the chamber when the outlet therefrom isclosed, the said means moving with the chamber to eject the fluidtherefrom when the outlet of the chamber moves into communication withthe first recited outlet, the said means embodying a rotary elementhaving spaced peripheral teeth or projections conforming to the contourof the chambers and adapted to enter and fill the said chambers.

4. An apparatus of the character described embodying a casing, having aninlet and a discharge outlet for the fluid to be operated upon, a rotaryelement in the casing provided with independent chambers or spaces forreceiving the fluid, said chambers each having a discharge outlet, thelast recited outlets being movable into and out of communication withthe first recited outlet as the element is rotated, means operating tofirst successively close the chambers to trap the fluid therein and thencompress the fluid within the chamber when the outlet there from isclosed, the said means moving with the chamber to eject the fluidtherefrom when the outlet of the chamber moves into communication withthe first recited outlet, the said means embodying a rotary elementhaving spaced peripheral teeth or projections conforming to the contourof the chambers and adapted to enter and fill the said chambers, meansfor rotating one of the elements and means operatively connecting thesaid elements.

- 5. An apparatus of the character described embodying a fluid receivingcasing having an inlet and a discharge outlet,-complementary rotatableelements each being provided with circumferentially spaced projectionsto form chambers therebetwecn, each of the chambers having a dischargeoutlet opening movable into and out of communication with [the firstrecited discharge outlet, and means for causing rotation of theelements. the said projections on each of the elements co-opcrating withthe chambers on the other element to first close the respective chambersto trap the fluid therein, then compress the fluid during that portionof the operation of the respective elements that the. discharge outletfrom the respective chambers is out of communication with the firstrecited outlet, and then discharge the fluid from the respectivechambers when the respective outlets move into communication with thefirst recited outlet.

6. An apparatus of the character described embodying a fluid receivingcasing having an inlet and a discharge outlet. con1plementary rotatableelements each being provided with circumferentially spaced projectionsto form chambers therebetween, each of the chambers having a dischargeoutlet opening movable into and out of communication with the firstrecited discharge outlet, and means for causing rotation of theelements, the said projections on each of the elements co-opcrating withthe chambers on the other element to first (close the respectivechambers to trap the H lid therein, then compress the fluid during thatportion of the operation of the respective elements that the dischargeoutlet from the respective chambers is out of communication with thefirst recited outlet, and then discharge the fluid from the respectivechambers when the respective outlets move into communication with thefirst recited outlet, the first recited discharge outlet embodyinghollow shafts individual to 7 An apparatus of the characterdescribedembodying a fluid receiving casing having an inlet and adischarge outlet, complementary rotatable elements each being providedwith circumferentially spaced projections to form chambers therebetween,each of the chambers having a discharge outlet opening movable into andout of communication with the first recited discharge-outlet, and meansfor causing rotation of the elements, the said projections on each ofthe elements cooperating with the chambers on the other element to firstclose the respective chambers to trap the fluid therein, then compressthe fluid during that portion of the operation of the respectiveelements that the discharge outlet from the respective chambers is outof communication with the first recited outlet, and then discharge thefluid from the respective chambers when the re spective outlets moveinto communication with the first recited outlet, the first reciteddischarge outlet embodying hollow shafts lndlvidual to the elements andupon which the respective elements rotate, there being an openingthrough each of the shafts and extending in directions lengthwisethereof, the last recited openings of the said shafts being so disposedwith relation to each other that the pocket outlet openings of the twomembers will be alternately brought into communication with the firstrecited outlet.

8. An apparatus of the character described embodying a fluid receivingcasing having an inlet and a discharge outlet, a pair of toothed rotaryelements in the casing, said elements meshing with each other, thespaces between adjacent teeth of each of the members forming fluidpockets, there being a discharge outlet leading from each pocket andmovable into and out of communication with the first recited outlet, theteeth of each element co-operating with the pockets of the other elementto first close the pockets to trap the fluid therein, then compress thefluid when the discharge outlets of the respective pockets are closed,and then veject the fluid from the pocket when the outlet therefrom isin communication with the first recited discharge outlet, and means forrotating the elements.

9. An apparatus of the character described embodying a fluid receivingcasing having an inlet and an outlet, a pair of toothed meshing rotaryelements in the casing, portion of each element between adjacent teethbeing shaped to form fluid pockets, there being a discharge outlet fromeach pocket movable into and out of communication with the first recitedoutlet, said teeth of each member being shaped to'conform to the contourof and fill the respective pockets of the other member whereb when themembers are rotated the teeth will 'rst close the respective pockets totrap the fluid therein. then exert a gradually increasing pressure uponthe fluid as the tooth enters the pocket during the period that theoutlet from the pocket is out of conmmnication with the first recitedoutlet. and then eject the fluid from the pocket when the outlettherefrom is in communication with the first recited outlet, and whenthe tooth completely fills the pocket.

10. An apparatus of the character described embodying a fluid receivingcasing having an inlet, a toothed like rotatable element having pocketsintermediate the teeth, said pockets each having a discharge outlet,means co-operating with the pockets for closing them to trap liquidtherein and exert a gradually increasing pressure upon the liquid. andmeans adjacent the axis of rotation of the element whereby the saiddischarge outlets from the pockets are closed during a predeterminedportion of the rotation of the element and are opened during anotherpredetermined portion of the rota tion of the element to permit thedischarge of the fluid from the pocket.

11. An apparatus of the character described embodying a fluid receivingcasing having an inlet. a rotatable element having pockets intermediatethe teeth, said pockets each having a discharge outlet, meanscooperating with the pockets for closing them to trap liquid therein andexert a gradually increasing pressure upon the liquid. and meansadjacent the axis of rotation of the element whereby the said dischargeoutlets from the pockets are closed during a predetermined portion ofthe rotation of the element and are opened during another prede terminedportion of the rotation of the element to permit the discharge of thefluid from the pocket, the second recited means embodying a passagewayfor receiving the fluid from the discharge outlets of the pockets.

12. An apparatus of the character described embodying a casing forreceiving fluid, and having an inlet, a pair of toothed like rotatableintermeshing elements each having pockets intermediate adjacent teeth,each of the pockets having a discharge outlet therefrom, the teeth ofeach element cooperating with the pockets of the other element to closethem to trap fluid therein and exert a gradually increasing pressureupon the fluid, and means adjacent the axes of rotation of the elementswhereb said discharge outlets from the pockets will be closed during apredetermined portion of the rotation of each element and will be openduring another predetermined portion of rotation of each element topermit the discharge of the fluid from the respective pockets.

13. An apparatus of the character described embodying a casing forreceiving fluid, and having an inlet, a 'pair of toothed like rotatableintermeshing elements each having pockets intermediate adjacent teeth,each of the pockets having a discharge outlet therefrom. the teeth ofeach element cooperating with the pockets of the other element to closethem to trap fluid therein and exert a gradually increasing pressureupon the fluid, and means adjacent the axes of rotation of the elementswhereby said discharge outlets from the pockets will be closed during apredetermined portion of the rotation of each element and will be openduring another predetermined portion of rotation of each element topermit the discharge of the fluid from the respective pockets. the saidmeans embodying passageways for receiving the fluid alternately from thedischarge outlets of the pockets, the said passageways having a commondelivery outlet.

14. An apparatus of the character described embodying a fluid receivingcasing having an inlet and a discharge outlet. a rotary element in thecasing provided with recesses forming chambers, said chambers each havina discharge outlet movable into and out of communication with the firstsaid discharge outlet, and means co-operating with the said chambers forclosing them, the said means operating to force the liquid from thechamber when the outlets are brought into communication.

In testimony whereof I have signed my name to this s ecification on this11th day of December, D. 1920.

GRANVILLLE H. STALLMAN.

